tests: add schema tests

Author: evenstensberg

Diff for: packages/generate-loader/package-lock.json

@@ -0,0 +1,3 @@
+module.exports = {
+	entry: "hey"
+};

Diff for: packages/generate-plugin/package-lock.json

@@ -0,0 +1,17 @@
+"use strict";
+
+const validation = require("../../../../bin/utils/validate-options");
+const { run } = require("../../../testUtils");
+
+test("validation", () => {
+	const mockExit = jest.spyOn(process, "exit").mockImplementation(() => {});
+	validation(null);
+	expect(mockExit).toHaveBeenCalledWith(-1);
+	mockExit.mockRestore();
+});
+
+test("validation-success", () => {
+	const { stdout, code } = run(__dirname, ["--config", "./options.js"]);
+	expect(stdout).toContain("Can't resolve 'hey'");
+	expect(code).toBe(2);
+});